Hello and welcome. My name is ***** ***** I’m a biologist with over 40 years of experience keeping fish. I’m sorry to hear about this problem. I suspect that your betta has not shredded his fins on anything in his tank. Instead, he is probably suffering from fin and tail rot. First, the fins appear shredded. As the disease progresses, pieces fall off and it eventually becomes internal, and is life threatening.
Breeders have turned to intensive inbreeding in bettas in order to get the long fins and unusual colors. But another result is that the fish now have weak immune systems. As a result, severe fin rot has become common. In some bettas, the fin rot becomes chronic and has to be treated several times a year.In others, one treatment solves the problem. But in others yet, nothing works.
The antibiotics you are using are very mild ones, and can’t deal with this severe fin rot. You’ll need a stronger antibiotic. Kanamycin (brand name Kanaplex) has been found to be most effective against fin rot. It’s worth a try. If you can’t find it locally, here is an online source:
Just follow the instructions on the packaging. Kanaplex is sized for tanks 5 gallons or larger. If your tank is smaller than that, you can try Maracyn 2 or Furan 2. Both are good options, but not quite as effective as Kanaplex. The source I gave you for Kanaplex also sells those products.
If you have more concerns, just let me know. I hope your betta will be able to reach a full recovery.
You’re very welcome. I wish you success with treatment.
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